The 2005 Implementing Rules and Regulations of the National Building Code of the Philippines (PD 1096) separate plumbing and sanitary permits. This is a change from previous versions, where they may have been combined or treated under a single permit. The revised IRR outlines specific requirements for both plumbing and sanitary systems, necessitating separate permits for each. 

Elaboration:

The National Building Code of the Philippines (PD 1096) is the primary law governing building design, construction, and occupancy in the Philippines. Its Implementing Rules and Regulations (IRR) provide detailed guidelines for complying with the code. The 2005 revision of the IRR introduced several changes, including the separation of plumbing and sanitary permits. 

Before this revision, plumbing and sanitary works might have been covered under a single building permit or a combined plumbing and sanitary permit. However, the 2005 IRR explicitly requires separate permits for plumbing and sanitary installations, reflecting a more detailed approach to building safety and public health. This separation allows for more focused review and inspection of each system, ensuring compliance with the specific requirements for each. 

The revised IRR covers various aspects of building construction, including architectural, civil/structural, electrical, mechanical, sanitary, and plumbing disciplines. The specific requirements for plumbing and sanitary systems are detailed within the IRR, necessitating separate permits for each. This ensures that both plumbing and sanitary installations are properly assessed and meet the standards set by the building code. 

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